可见光催化隧道净化材料构建及应用机理研究

Nowadays, the problem of highway tunnel air contamination is getting more and more serious. Traditional tunnel ventilation method not only have limited effect on automobile exhaust purification but also cost high expenses on ventilation equipment and operating process, moreover, it will cause second air pollution to around environment. It is of important theoretical and practical significance to develop a novel method to effectively purifying vehicle exhaust in the tunnel, which is necessary to protect the environment, maintain human health and promote the social sustainable development.. A facile chemical solution method will be adopted for synthesizing CdSe/CdS double-sensitized titanium dioxide nanofilm with controllable CdSe/CdS ratios. Visible light from 400nm to 700nm can be absorbed by this constructed materials leading to high photocatalytic efficiency with low cost. The effects of the structure and ratio of CdS, CdSe and the size and specific surface area of titanium dioxide nano-film substrates on the photocatalytic property of the air pollution will be studied in details in a simulative tunnel environment. The synthetic method and photocatalyst mechanism in simulative tunnel environment of CdSe/CdS double-sensitized titanium dioxide nanofilm are to be revealed, which can provide theoretical basis for constructing high performance new type photocatalytic materials. The illumination angle and distance effects will be discussed under the irradiation of candescent light as in the tunnel environment. The photocatalytic performance of the CdSe/CdS double-sensitized titanium dioxide nanofilm applied in long period in simulative tunnel will be evaluated and a recycling method of this nanofilm will be obtained..

针对当前日趋严重的隧道空气污染状况以及传统解决方法造价高、效果不理想、造成二次污染周边环境等问题，研发一种有效的净化隧道内空气污染的方法，对于促进长大隧道的进一步发展、保护环境、维护社会可持续发展都具有重要意义。本项目在理论可行的基础上，通过成本低廉的化学溶液法合成CdSe/CdS量子点共敏化二氧化钛纳米薄膜，构建一类造价低廉，催化效率高，光激发响应可以覆盖整个可见光光谱的新型光催化材料；研究在可见光照射下，不同CdSe、CdS沉积厚度、比例,二氧化钛薄膜的结构、比表面积及组分间排列方式等因素对光催化净化隧道空气污染物效果的影响，找到最优方案，为新型高效光催化材料的构建提供理论依据；在模拟隧道空气污染环境下，分析该纳米薄膜光催化降解隧道空气污染物的作用原理，分析该新型光催化材料在白炽灯照射下光照角度和距离等因素的影响；研究该纳米薄膜长周期使用下的性能衰退机理，获得循环使用的方法。

针对当前日趋严重的隧道空气污染状况以及传统解决方法造价高、效果不理想、造成二次污染周边环境等问题，研发一种有效的净化隧道内空气的方法，对于促进长、大隧道的进一步发展，保护环境，维护社会可持续发展都具有重要意义。本项目在理论可行的基础上，通过成本低廉的化学溶液法合成量子点共敏化纳米材料，构建一类造价低廉，催化效率高，光激发响应可以覆盖整个可见光光谱范围的新型光催化材料；研究在可见光照射下，不同组分、不同比例、不同比表面积及组分间排列方式等结构因素与光催化降解隧道空气污染物的性能之间的关系，找到最优方案，为新型高效光催化材料的构建提供理论依据；在模拟隧道空气污染环境下，分析该纳米材料光催化降解隧道空气污染物的作用原理，分析该新型光催化材料在不同隧道灯光照射下的影响；研究该纳米薄膜长周期使用下的性能衰退机理，获得循环使用的方法。